Why Federal Pacific and Zinsco Panels Get Flagged
A breaker has one job. When a circuit is overloaded or shorted, it trips and cuts the power before the wires overheat. Federal Pacific Electric (FPE) Stab-Lok breakers and Zinsco breakers both have a long track record of failing at that job.
Independent testing of Stab-Lok breakers found that many did not trip when they should. Zinsco breakers have a different problem. They can overheat where they clip onto the aluminum bus bars, and in some cases the breaker fuses to the bus and cannot shut off at all.
Both brands were widely installed in homes built from the 1950s through the 1980s, and both companies are long gone. There are no new, listed replacement parts made by the original manufacturers. A panel can look fine and seem to work for decades, which is exactly why these panels are easy to overlook.
How to Identify a Federal Pacific Panel
Before you touch anything, remember that the panel door is safe to open but the inner cover is not. Look without removing any screws.
Signs of a Federal Pacific panel include:
- The words Federal Pacific Electric, FPE or Stab-Lok on the door label or panel face
- Thin breakers with a red or orange stripe on the handle
- A panel installed in a home built roughly from the 1950s to the early 1980s
How to Identify a Zinsco Panel
Signs of a Zinsco panel include:
- The Zinsco name, or a Sylvania or GTE Sylvania label on the door
- Breaker handles in a mix of colors, often blue, red, brown or green
- Visible aluminum bus bars behind the breakers on older units
If you are still not sure, snap a photo of the label and the breakers and call us at (734) 210-7667. We are glad to take a look during a visit.
What to Do Until the Panel Is Replaced
If you just found out your home has a Federal Pacific or Zinsco panel, there is no need to panic, but it is worth acting soon. In the meantime, a few habits help:
- Avoid running several large appliances on the same circuit at once
- Do not reset a breaker that trips repeatedly, call us instead
- Never remove the panel’s inner cover or try to swap breakers yourself
- Note any warm spots, buzzing, flickering lights or burning smells and tell us about them
A warm panel or a burning smell is urgent. Turn off what you safely can and call us right away.
Home Inspections, Insurance and Selling Your Home
A lot of our Federal Pacific panel replacement calls start with paperwork. A home inspector writes the panel up during a sale, or an insurance company asks for the panel brand on a renewal form. Suddenly a panel nobody thought about becomes a deadline.
We can help in a few ways:
- Before listing. Replacing the panel ahead of time removes a common inspection item and a likely repair request.
- During a sale. We provide a written estimate buyers and sellers can use while negotiating, then schedule the work around closing.
- For insurance. Once the permit is inspected and closed, you have documentation showing the old panel is gone.
If you are buying an older home in Ann Arbor, Ypsilanti or Saline, a separate electrical inspection can also flag other issues like ungrounded outlets or old wiring.
Replacing an Old Fuse Box
Some older homes skipped the breaker era entirely and still run on a fuse box. Fuses do protect circuits, but many fuse boxes are limited to 60 amps, and they invite unsafe shortcuts like putting a larger fuse in a socket to stop it from blowing.
Fuse box replacement follows the same process as a Federal Pacific panel replacement. If your home needs more capacity for modern appliances, we often combine it with a 200 amp service upgrade. Homes with a fuse box sometimes still have original knob and tube wiring, so we check for that too.
What Federal Pacific Panel Replacement Involves
- Walkthrough. We confirm the panel type, check your service size and look at the condition of the wiring coming into the box.
- Permit. We pull the electrical permit and coordinate with DTE if the power needs to be shut off at the meter.
- Panel swap. We remove the old panel, install a new one, reconnect and label every circuit, and add arc-fault and ground-fault protection where code calls for it.
- Inspection. We meet the inspector and walk you through your new panel once it passes.
Most straight replacements are completed in a single day. If we find brittle wiring, aluminum branch circuits or a damaged meter base, we explain what we found and your options before doing any extra work.
While the Panel Is Open
A new panel is a natural time to add a whole-house surge protector and to plan spaces for future loads such as an EV charger, a heat pump or a generator inlet. Planning now saves you from reopening the panel in a year or two.
A Local Team for Panel Replacement in Ann Arbor
Current Electrical Systems has served Ann Arbor and Washtenaw County since 1994. Our electricians are union trained through IBEW Local 252, and panel work is one of the jobs we do most. We keep the work area clean, explain what we are doing and leave you with a panel you never have to wonder about again.